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Greater Horseshoe Bats and Their Insect Prey: the Impact and Importance of Climate Change and Agri-Environment Schemes

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Greater Horseshoe Bats and Their Insect Prey: the Impact and Importance of Climate Change and Agri-Environment Schemes 1 Greater horseshoe bats and their insect prey: the impact and importance of climate change and agri-environment schemes Final report to PTES, February 2015 Project Head: Professor Gareth Jones1, [email protected] Co-supervisor: Dr Kate Barlow2, [email protected] Research collaborator: Dr Roger Ransome1, [email protected] Research assistant: Lia Gilmour1 [email protected] 1 School of Biological Sciences, University of Bristol 2Bat Conservation Trust 2 Executive summary • Climate warming over the last few decades has led to phenological shifts for many species and is predicted to continue affecting biodiversity worldwide under certain climate projections (IPCC, 2014). • We have analysed phenological changes in diets of greater horseshoe bats (Rhinolophus ferrumequinum) by microscopic analysis of faecal samples collected from Woodchester Mansion between 1968 and 2012 to determine trends in the phenology of important prey species in the diet, and investigated whether diet phenology was related to summer roost counts and birth timing. • Analysis of timings of appearance (peak and first appearance) for key prey in diet between 1969-2012 showed that the peaks in dietary composition for cockchafers (Melolontha melolontha) and crane flies (Tipulidae) eaten during the spring have advanced significantly despite considerable year-to-year variation. • Long-term study of this colony by Dr R. D. Ransome shows that mean date of birth of pups is also getting significantly earlier for greater horseshoe bats at this site. • We therefore tested the hypothesis that the timing of births is positively correlated with the appearance of key prey items in the diet in spring, and found significant positive correlations between mean date of birth and timing of peak and first appearance of cockchafers in the diet, and with timing of peak appearance of springtime tipulids. We discuss the possibility and implications of both prey availability and bat birth timing being driven by long-term changes in climate. • Changes in mean percentage dietary volume of key prey groups (moths, Aphodius beetles and M. melolontha) are also analysed. Moths have decreased in the diet of bats at Woodchester since 1969, and Aphodius and M. melolontha have increased. Moth trends may be related to changes in moth populations over time and Aphodius increases may be in part due to habitat management under agri-environment schemes. It is uncertain why M. melolontha have increased in bats’ diets over time. • Our results have implications for greater horseshoe bat conservation, as continuing shifts in diet phenology due to climate or habitat management may affect the future survival of maternity colonies including the one studied here. • Ongoing work will include a comparison of morphological dietary analyses presented here with those from molecular analyses over same time period (in collaboration with Kristine Bohmann at the University of Copenhagen). Comparison with molecular findings is important as will allow us to look at changes in diversity of some key prey groups (e.g. moths, tipulids), over time. • The next stages of work are to test the hypotheses that agri-environment schemes may benefit greater horseshoe bat populations by improving food availability, through field surveys and habitat mapping. This work is being carried out by Jérémy Froidevaux, PhD student who started October 2014, supervised by the Project Lead, Gareth Jones. 3 Introduction During the last few decades, world temperatures have been significantly warmer and are predicted to rise further under future climate change projections, causing shifts in weather systems and sea level rises (IPCC, 2014). Climate change has already led to phenological shifts in many taxa, has caused biodiversity declines and continues to threaten global species populations on a large scale (Walther et al., 2002). For example, modelling under future climate scenarios indicates an effect on distributions of European bat species (Rebelo et al., 2010). On a more local scale, warmer springs have been related to earlier egg laying in some bird species (e.g. Sanz, 2003; Pearce-Higgins, 2005) and earlier birth dates in greater horseshoe bats (Rhinolophus ferrumequinum) in southern Britain (Ransome & McOwat, 1994). Changes in the time of breeding may be linked to earlier emergence of key insect prey items (e.g. Pearce-Higgins, 2005), which are highly influenced by local climatic conditions such as temperature and humidity (e.g. Wagenhoff et al., 2014). As a result of climate change, mismatching of timings of key prey emergence and the phenology of species eating those prey, could be a major determining factor in the future survival of many species, under certain climate scenarios (Visser & Both, 2005). The intensification of agriculture has also contributed to biodiversity declines in a wide range of taxa over the past 50 years in the UK and other parts of northern Europe (Krebs et al., 1999; Robinson & Sutherland 2002). Agricultural landscapes are especially important for biodiversity, as they comprise about three-quarters of the UK’s land area (Defra, 2008). Agri- environment schemes represent one way of balancing the negative impacts of agricultural development by maintaining and encouraging biodiversity. Under agri-environment schemes, landowners are paid to enhance habitats in areas where threatened species occur. Evidence for whether these schemes are successful is lacking. One often-quoted success story involves how agri-environment schemes may have promoted population growth in greater horseshoe bat populations (e.g. Longley, 2003; Maclean, 2010; RSPB, 2013). Ecological data collected Roger Ransome and colleagues at the University of Bristol were used to suggest appropriate habitat management to assist with the conservation of the species under the Species Recovery Program (SRP) and then later the Countryside Stewardship Scheme (CSS) (Ransome, 1996; Duvergé & Jones, 2003). Land managers who maintained land close to maternity colonies were encouraged to apply for grant aid through CSS administered by the Department for Environment, Food and Rural Affairs (Defra). The National Bat Monitoring Programme (NBMP) has collected data on numbers of bats in summer maternity roosts of greater horseshoe bats since 1997 (BCT, 2013, 2015; Barlow et al., 2015). There has been a significant upward trend in the count data with an overall increase of 109% since the base year (1999). Although some of this increase may be due to climate change, the success of CSS may have made a major contribution to the impressive increase in numbers of a flagship conservation species (Longley, 2003; RSPB, 2013). More recently the guidelines developed under CSS have been absorbed into Higher-Level Stewardship schemes, and the enhancement protocols around greater horseshoe bat maternity colonies continue to be implemented. The greater horseshoe bat is one of five mammal species that will receive bespoke management recommendations under new Countryside Stewardship schemes opening in 2015. 4 The greater horseshoe bat, one of the larger British bat species, is at the northern edge of its range in Britain with a distribution confined to south Wales and south west England (Aulagnier et al., 2008; JNCC, 2013). Although the species is listed as Least Concern on the IUCN red list (Aulagnier et al., 2008), it is locally threatened in Britain and protected under the UK Biodiversity framework, as well as being listed on Annex IV and II of the European Commission Habitats Directive (JNCC, 1992, 2013; JNCC & Defra, 2012). Eight Special Areas of Conservation (SACs) are listed with this species as a primary feature of site qualification and three are listed where it is a qualifying feature. The majority of major maternity roosts and hibernacula are listed as Sites of Special Scientific Interest (SSSIs), including the maternity roost at Woodchester Mansion, Gloucestershire, the focus of this project. Woodchester Mansion is an unfinished gothic revival mansion house, surrounded by parkland, woodland and grazed pasture and is an important maternity colony for greater horseshoe bats in the area. The colony has been studied extensively by Dr Roger Ransome and colleagues for over 50 years and long-term data have been collected including colony statistics such as births and deaths, as well as diet data (e.g. Ransome & McOwat, 1994; Ransome, 1996; 1997; 2000). As part of this long-term study, faeces have been collected from underneath the colony on a weekly basis since 1968. Data collected over such a long period is a valuable resource for studying changes in diet phenology and this can be related to changes in climate, agricultural practices and other external factors that may affect a colony of bats. Greater horseshoe bats are highly selective in choosing their prey, conforming to optimal foraging models and only selecting lower quality prey (Diptera and Ichneumonidae), when higher quality items (Melolontha melolontha and Lepidoptera) are scarce (Jones, 1990; Ransome, 1996; 1997; 2000). Aphodius beetles are also an important food source for juvenile bats during the development of flight and hunting skills in summer and early autumn and can be important for lactating mothers when moths are scarce (Ransome, 1996; 2000; Duvergé & Jones, 2003). Colonies are dependent on a habitat that supports these prey, as well as the other groups mentioned (Ransome, 1996; 1997; 2000; Duvergé & Jones, 2003). Both the topography of the habitat surrounding a roost and how it is
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